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<FONT color="green">001</FONT>    // Copyright (c) 2013, Mike Samuel<a name="line.1"></a>
<FONT color="green">002</FONT>    // All rights reserved.<a name="line.2"></a>
<FONT color="green">003</FONT>    //<a name="line.3"></a>
<FONT color="green">004</FONT>    // Redistribution and use in source and binary forms, with or without<a name="line.4"></a>
<FONT color="green">005</FONT>    // modification, are permitted provided that the following conditions<a name="line.5"></a>
<FONT color="green">006</FONT>    // are met:<a name="line.6"></a>
<FONT color="green">007</FONT>    //<a name="line.7"></a>
<FONT color="green">008</FONT>    // Redistributions of source code must retain the above copyright<a name="line.8"></a>
<FONT color="green">009</FONT>    // notice, this list of conditions and the following disclaimer.<a name="line.9"></a>
<FONT color="green">010</FONT>    // Redistributions in binary form must reproduce the above copyright<a name="line.10"></a>
<FONT color="green">011</FONT>    // notice, this list of conditions and the following disclaimer in the<a name="line.11"></a>
<FONT color="green">012</FONT>    // documentation and/or other materials provided with the distribution.<a name="line.12"></a>
<FONT color="green">013</FONT>    // Neither the name of the OWASP nor the names of its contributors may<a name="line.13"></a>
<FONT color="green">014</FONT>    // be used to endorse or promote products derived from this software<a name="line.14"></a>
<FONT color="green">015</FONT>    // without specific prior written permission.<a name="line.15"></a>
<FONT color="green">016</FONT>    // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS<a name="line.16"></a>
<FONT color="green">017</FONT>    // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT<a name="line.17"></a>
<FONT color="green">018</FONT>    // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS<a name="line.18"></a>
<FONT color="green">019</FONT>    // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE<a name="line.19"></a>
<FONT color="green">020</FONT>    // COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,<a name="line.20"></a>
<FONT color="green">021</FONT>    // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,<a name="line.21"></a>
<FONT color="green">022</FONT>    // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;<a name="line.22"></a>
<FONT color="green">023</FONT>    // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER<a name="line.23"></a>
<FONT color="green">024</FONT>    // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT<a name="line.24"></a>
<FONT color="green">025</FONT>    // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN<a name="line.25"></a>
<FONT color="green">026</FONT>    // ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE<a name="line.26"></a>
<FONT color="green">027</FONT>    // POSSIBILITY OF SUCH DAMAGE.<a name="line.27"></a>
<FONT color="green">028</FONT>    <a name="line.28"></a>
<FONT color="green">029</FONT>    package org.owasp.html.examples;<a name="line.29"></a>
<FONT color="green">030</FONT>    <a name="line.30"></a>
<FONT color="green">031</FONT>    import java.io.IOException;<a name="line.31"></a>
<FONT color="green">032</FONT>    import java.util.ArrayList;<a name="line.32"></a>
<FONT color="green">033</FONT>    import java.util.List;<a name="line.33"></a>
<FONT color="green">034</FONT>    <a name="line.34"></a>
<FONT color="green">035</FONT>    import org.owasp.html.Handler;<a name="line.35"></a>
<FONT color="green">036</FONT>    import org.owasp.html.HtmlPolicyBuilder;<a name="line.36"></a>
<FONT color="green">037</FONT>    import org.owasp.html.HtmlSanitizer;<a name="line.37"></a>
<FONT color="green">038</FONT>    import org.owasp.html.HtmlStreamEventReceiver;<a name="line.38"></a>
<FONT color="green">039</FONT>    import org.owasp.html.HtmlStreamRenderer;<a name="line.39"></a>
<FONT color="green">040</FONT>    import org.owasp.html.HtmlTextEscapingMode;<a name="line.40"></a>
<FONT color="green">041</FONT>    import org.owasp.html.PolicyFactory;<a name="line.41"></a>
<FONT color="green">042</FONT>    import org.owasp.html.TagBalancingHtmlStreamEventReceiver;<a name="line.42"></a>
<FONT color="green">043</FONT>    <a name="line.43"></a>
<FONT color="green">044</FONT>    /**<a name="line.44"></a>
<FONT color="green">045</FONT>     * Uses a custom event receiver to emit the domain of a link or inline image<a name="line.45"></a>
<FONT color="green">046</FONT>     * after the link or image.<a name="line.46"></a>
<FONT color="green">047</FONT>     */<a name="line.47"></a>
<FONT color="green">048</FONT>    public class UrlTextExample {<a name="line.48"></a>
<FONT color="green">049</FONT>    <a name="line.49"></a>
<FONT color="green">050</FONT>      /** An event receiver that emits the domain of a link or image after it. */<a name="line.50"></a>
<FONT color="green">051</FONT>      static class AppendDomainAfterText implements HtmlStreamEventReceiver {<a name="line.51"></a>
<FONT color="green">052</FONT>        final HtmlStreamEventReceiver underlying;<a name="line.52"></a>
<FONT color="green">053</FONT>        private final List&lt;String&gt; pendingText = new ArrayList&lt;String&gt;();<a name="line.53"></a>
<FONT color="green">054</FONT>    <a name="line.54"></a>
<FONT color="green">055</FONT>        AppendDomainAfterText(HtmlStreamEventReceiver underlying) {<a name="line.55"></a>
<FONT color="green">056</FONT>          this.underlying = underlying;<a name="line.56"></a>
<FONT color="green">057</FONT>        }<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>        public void openDocument() {<a name="line.59"></a>
<FONT color="green">060</FONT>          underlying.openDocument();<a name="line.60"></a>
<FONT color="green">061</FONT>        }<a name="line.61"></a>
<FONT color="green">062</FONT>        public void closeDocument() {<a name="line.62"></a>
<FONT color="green">063</FONT>          underlying.closeDocument();<a name="line.63"></a>
<FONT color="green">064</FONT>        }<a name="line.64"></a>
<FONT color="green">065</FONT>        public void openTag(String elementName, List&lt;String&gt; attribs) {<a name="line.65"></a>
<FONT color="green">066</FONT>          underlying.openTag(elementName, attribs);<a name="line.66"></a>
<FONT color="green">067</FONT>    <a name="line.67"></a>
<FONT color="green">068</FONT>          String trailingText = null;<a name="line.68"></a>
<FONT color="green">069</FONT>    <a name="line.69"></a>
<FONT color="green">070</FONT>          if (!attribs.isEmpty()) {<a name="line.70"></a>
<FONT color="green">071</FONT>            // Figure out which attribute we should look for.<a name="line.71"></a>
<FONT color="green">072</FONT>            String urlAttrName = null;<a name="line.72"></a>
<FONT color="green">073</FONT>            if ("a".equals(elementName)) {<a name="line.73"></a>
<FONT color="green">074</FONT>              urlAttrName = "href";<a name="line.74"></a>
<FONT color="green">075</FONT>            } else if ("img".equals(elementName)) {<a name="line.75"></a>
<FONT color="green">076</FONT>              urlAttrName = "src";<a name="line.76"></a>
<FONT color="green">077</FONT>            }<a name="line.77"></a>
<FONT color="green">078</FONT>            if (urlAttrName != null) {<a name="line.78"></a>
<FONT color="green">079</FONT>              // Look for the attribute, and after it for its value.<a name="line.79"></a>
<FONT color="green">080</FONT>              for (int i = 0, n = attribs.size(); i &lt; n; i += 2) {<a name="line.80"></a>
<FONT color="green">081</FONT>                if (urlAttrName.equals(attribs.get(i))) {<a name="line.81"></a>
<FONT color="green">082</FONT>                  String url = attribs.get(i+1).trim();<a name="line.82"></a>
<FONT color="green">083</FONT>                  String domain = domainOf(url);<a name="line.83"></a>
<FONT color="green">084</FONT>                  if (domain != null) {<a name="line.84"></a>
<FONT color="green">085</FONT>                    trailingText = " - " + domain;<a name="line.85"></a>
<FONT color="green">086</FONT>                  }<a name="line.86"></a>
<FONT color="green">087</FONT>                  break;<a name="line.87"></a>
<FONT color="green">088</FONT>                }<a name="line.88"></a>
<FONT color="green">089</FONT>              }<a name="line.89"></a>
<FONT color="green">090</FONT>            }<a name="line.90"></a>
<FONT color="green">091</FONT>          }<a name="line.91"></a>
<FONT color="green">092</FONT>          if (HtmlTextEscapingMode.isVoidElement(elementName)) {<a name="line.92"></a>
<FONT color="green">093</FONT>            // A void element like &lt;img&gt; will not have a corresponding closeTag<a name="line.93"></a>
<FONT color="green">094</FONT>            // call.<a name="line.94"></a>
<FONT color="green">095</FONT>            if (trailingText != null) {<a name="line.95"></a>
<FONT color="green">096</FONT>              text(trailingText);<a name="line.96"></a>
<FONT color="green">097</FONT>            }<a name="line.97"></a>
<FONT color="green">098</FONT>          } else {<a name="line.98"></a>
<FONT color="green">099</FONT>            // Push the trailing text onto a stack so when we see the corresponding<a name="line.99"></a>
<FONT color="green">100</FONT>            // close tag, we can emit the text.<a name="line.100"></a>
<FONT color="green">101</FONT>            pendingText.add(trailingText);<a name="line.101"></a>
<FONT color="green">102</FONT>          }<a name="line.102"></a>
<FONT color="green">103</FONT>        }<a name="line.103"></a>
<FONT color="green">104</FONT>        public void closeTag(String elementName) {<a name="line.104"></a>
<FONT color="green">105</FONT>          underlying.closeTag(elementName);<a name="line.105"></a>
<FONT color="green">106</FONT>          // Pull the trailing text for the recently closed element off the stack.<a name="line.106"></a>
<FONT color="green">107</FONT>          int pendingTextSize = pendingText.size();<a name="line.107"></a>
<FONT color="green">108</FONT>          if (pendingTextSize != 0) {<a name="line.108"></a>
<FONT color="green">109</FONT>            String trailingText = pendingText.remove(pendingTextSize - 1);<a name="line.109"></a>
<FONT color="green">110</FONT>            if (trailingText != null) {<a name="line.110"></a>
<FONT color="green">111</FONT>              text(trailingText);<a name="line.111"></a>
<FONT color="green">112</FONT>            }<a name="line.112"></a>
<FONT color="green">113</FONT>          }<a name="line.113"></a>
<FONT color="green">114</FONT>        }<a name="line.114"></a>
<FONT color="green">115</FONT>        public void text(String text) {<a name="line.115"></a>
<FONT color="green">116</FONT>          underlying.text(text);<a name="line.116"></a>
<FONT color="green">117</FONT>        }<a name="line.117"></a>
<FONT color="green">118</FONT>      }<a name="line.118"></a>
<FONT color="green">119</FONT>    <a name="line.119"></a>
<FONT color="green">120</FONT>      public static void run(Appendable out, String... argv) throws IOException {<a name="line.120"></a>
<FONT color="green">121</FONT>        PolicyFactory policyBuilder = new HtmlPolicyBuilder()<a name="line.121"></a>
<FONT color="green">122</FONT>          .allowAttributes("src").onElements("img")<a name="line.122"></a>
<FONT color="green">123</FONT>          .allowAttributes("href").onElements("a")<a name="line.123"></a>
<FONT color="green">124</FONT>          // Allow some URLs through.<a name="line.124"></a>
<FONT color="green">125</FONT>          .allowStandardUrlProtocols()<a name="line.125"></a>
<FONT color="green">126</FONT>          .allowElements(<a name="line.126"></a>
<FONT color="green">127</FONT>              "a", "label", "h1", "h2", "h3", "h4", "h5", "h6",<a name="line.127"></a>
<FONT color="green">128</FONT>              "p", "i", "b", "u", "strong", "em", "small", "big", "pre", "code",<a name="line.128"></a>
<FONT color="green">129</FONT>              "cite", "samp", "sub", "sup", "strike", "center", "blockquote",<a name="line.129"></a>
<FONT color="green">130</FONT>              "hr", "br", "col", "font", "span", "div", "img",<a name="line.130"></a>
<FONT color="green">131</FONT>              "ul", "ol", "li", "dd", "dt", "dl", "tbody", "thead", "tfoot",<a name="line.131"></a>
<FONT color="green">132</FONT>              "table", "td", "th", "tr", "colgroup", "fieldset", "legend"<a name="line.132"></a>
<FONT color="green">133</FONT>          ).toFactory();<a name="line.133"></a>
<FONT color="green">134</FONT>    <a name="line.134"></a>
<FONT color="green">135</FONT>        StringBuilder htmlOut = new StringBuilder();<a name="line.135"></a>
<FONT color="green">136</FONT>        HtmlSanitizer.Policy policy = policyBuilder.apply(<a name="line.136"></a>
<FONT color="green">137</FONT>            // The tag balancer passes events to AppendDomainAfterText which<a name="line.137"></a>
<FONT color="green">138</FONT>            // assumes that openTag and closeTag events line up with one-another.<a name="line.138"></a>
<FONT color="green">139</FONT>            new TagBalancingHtmlStreamEventReceiver(<a name="line.139"></a>
<FONT color="green">140</FONT>                // The domain appender forwards events to the HTML renderer,<a name="line.140"></a>
<FONT color="green">141</FONT>                new AppendDomainAfterText(<a name="line.141"></a>
<FONT color="green">142</FONT>                    // which puts tags and text onto the output buffer.<a name="line.142"></a>
<FONT color="green">143</FONT>                    HtmlStreamRenderer.create(htmlOut, Handler.DO_NOTHING)<a name="line.143"></a>
<FONT color="green">144</FONT>                )<a name="line.144"></a>
<FONT color="green">145</FONT>            )<a name="line.145"></a>
<FONT color="green">146</FONT>        );<a name="line.146"></a>
<FONT color="green">147</FONT>    <a name="line.147"></a>
<FONT color="green">148</FONT>        for (String input : argv) {<a name="line.148"></a>
<FONT color="green">149</FONT>          HtmlSanitizer.sanitize(input, policy);<a name="line.149"></a>
<FONT color="green">150</FONT>        }<a name="line.150"></a>
<FONT color="green">151</FONT>    <a name="line.151"></a>
<FONT color="green">152</FONT>        out.append(htmlOut);<a name="line.152"></a>
<FONT color="green">153</FONT>      }<a name="line.153"></a>
<FONT color="green">154</FONT>    <a name="line.154"></a>
<FONT color="green">155</FONT>      public static void main(String... argv) throws IOException {<a name="line.155"></a>
<FONT color="green">156</FONT>        run(System.out, argv);<a name="line.156"></a>
<FONT color="green">157</FONT>        System.out.println();<a name="line.157"></a>
<FONT color="green">158</FONT>      }<a name="line.158"></a>
<FONT color="green">159</FONT>    <a name="line.159"></a>
<FONT color="green">160</FONT>    <a name="line.160"></a>
<FONT color="green">161</FONT>      /**<a name="line.161"></a>
<FONT color="green">162</FONT>       * The domain (actually authority component) of an HTML5 URL.<a name="line.162"></a>
<FONT color="green">163</FONT>       * If the input is not hierarchical, then this has undefined behavior.<a name="line.163"></a>
<FONT color="green">164</FONT>       */<a name="line.164"></a>
<FONT color="green">165</FONT>      private static String domainOf(String url) {<a name="line.165"></a>
<FONT color="green">166</FONT>        int start = -1;<a name="line.166"></a>
<FONT color="green">167</FONT>        if (url.startsWith("//")) {<a name="line.167"></a>
<FONT color="green">168</FONT>          start = 2;<a name="line.168"></a>
<FONT color="green">169</FONT>        } else {<a name="line.169"></a>
<FONT color="green">170</FONT>          start = url.indexOf("://");<a name="line.170"></a>
<FONT color="green">171</FONT>          if (start &gt;= 0) { start += 3; }<a name="line.171"></a>
<FONT color="green">172</FONT>        }<a name="line.172"></a>
<FONT color="green">173</FONT>        if (start &lt; 0) { return null; }<a name="line.173"></a>
<FONT color="green">174</FONT>        for (int i = 0; i &lt; start - 3; ++i) {<a name="line.174"></a>
<FONT color="green">175</FONT>          switch (url.charAt(i)) {<a name="line.175"></a>
<FONT color="green">176</FONT>          case '/': case '?': case '#': return null;<a name="line.176"></a>
<FONT color="green">177</FONT>          default: break;<a name="line.177"></a>
<FONT color="green">178</FONT>          }<a name="line.178"></a>
<FONT color="green">179</FONT>        }<a name="line.179"></a>
<FONT color="green">180</FONT>        int end = url.length();<a name="line.180"></a>
<FONT color="green">181</FONT>        for (int i = start; i &lt; end; ++i) {<a name="line.181"></a>
<FONT color="green">182</FONT>          switch (url.charAt(i)) {<a name="line.182"></a>
<FONT color="green">183</FONT>          case '/': case '?': case '#': end = i; break;<a name="line.183"></a>
<FONT color="green">184</FONT>          default: break;<a name="line.184"></a>
<FONT color="green">185</FONT>          }<a name="line.185"></a>
<FONT color="green">186</FONT>        }<a name="line.186"></a>
<FONT color="green">187</FONT>        if (start &lt; end) {<a name="line.187"></a>
<FONT color="green">188</FONT>          return url.substring(start, end);<a name="line.188"></a>
<FONT color="green">189</FONT>        } else {<a name="line.189"></a>
<FONT color="green">190</FONT>          return null;<a name="line.190"></a>
<FONT color="green">191</FONT>        }<a name="line.191"></a>
<FONT color="green">192</FONT>      }<a name="line.192"></a>
<FONT color="green">193</FONT>    }<a name="line.193"></a>




























































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